Method of making stay bolts



Patented Get. 31), 1923 am. STATES PATENT FFI,

JOHN ROGERS FLANNERY, O1? PITTSBURGH, PENNSYLVANIA, ASSIGNOR TO FLANNERY BOLT COMPANY, OF PITTSBURGH, PENNSYLVANIA, A CORPORATION OF DELA- WARE.

METHOD OF MAKING STAY BOLTS.

Application filed March 18, 1921.

To all whom it may concern:

Be it known that I, JOHN Itoenns FLAN- NERY, a citizen of the United States, and a resident of Pittsburgh, in the county of 5 Allegheny and State of Pennsylvania, have invented certain new and useful Improvements in Method of Making Stay Bolts; and I do hereby declare the following to be a full, clear, and exact description of the invention,

such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to an improvement in the manufacture of staybol-ts for boilers,

one object of the invention being to produce a staybolt for steam boilers, made from a solid bar having ahead formed preferably forged, at one end and provided with a small central bore drilled longitudinally through the bolt, said drilled bore extending from end to end thereof and through the previously formed head, and to provide for the closing of one or both end of the bore. lVith these and other objects in view, the invention consists in certain features as hereinafter set forth and pointed out in the claims.

In the accompanying drawings, Figure 1 is a view of a solid bar from which the bolt may be made; Figure 2 is a view showing the head formed on the solid bar or blank, and Figure 3 is a view showing a completed staybolt having a central longitudinal bore' extending from end to end of the same and closures for the ends of said bore.

My present invention contemplates an improvement upon the method and article covered by my present Patent No. 1,336,213, granted April 6th, 1920, wherein a tell-tale bore is drilled longitudinally through the bolt and made to terminate within the previously formed head, and to avoid the necessity of accurately calculating the duration of the drilling operation to insure the termination of the tell-tale bore at a proper point within the formed head, Tell-tale holes-or bores in staybolts are quite small in diameter and prior to the invention disclosed in my said former patent, the drilling of tell-tale holes in staybolts, which would extend throughout the length of the body portion of long boiler staybolts had Serial No. 453,219.

not been successfully accomplished, but in said patent, the holes were made to terminate within the formed head at the outer end. of the bolt. Experiment has developed the fact that the bores or longitudinal holes may be drilled completely from end to end of the bolt and therefore entirely through the headed end thereof, but it is important that such drilling operation shall be performed after the head shall have been formed at the end of the bar or blank in order to avoid closing of a prohibitive portion of the bore which would be liable to happen if the forming be done subsequently to the drilling of the hole.

In accordance with my present invention, I take a solid bar or blank 1 of suitable metal and at one end of said bar or blank, I form a head 2 such for example as employed for a staybolt of the flexible type. After the head 2 has been formed, I drill a small central bore 3 throughout the length of the body of the bolt and completely through the head 2, by means of apparatus such, for example, as described in my former patent hereinbefore identified. After the bore shall have been thus drilled through the body of the bolt and its formed head, its outer end will be closed by inserting thereinto, a plug 4: and this plug may constitute a permanent closure. The inner or fire-box end of the tell-tale bore may also be closed by a plug 5 to prevent the entrance of dust, scale or other foreign solid matter which might clog said bore, and this plug 5 may constitute a removable closure for the inner end of the tell-tale bore.

Having fully described my invention what I claim as new and desire to secure by Letters-Patent, is 2- 1. The herein described method of making a staybolt, consisting in forming a head at one end of a solid bar of metal, then drilling a hole longitudinally through the bolt thus formed and causing said hole to extend throughout the full length of the body of the bolt and completely througl'i its formed head, and inserting a closure in the head to close the outer end of said hole.

2. The herein described method of making a staybolt, consisting in forming a head at one end of a solid bar of metal, then drillg l e 1,472,390

ing a hole longitudin allythrough the bolt specification in thefpresenoe of a subscribthus formed and causing said hole to exing Wit/HESS V tend throughout the full length of the body of the bolt and completely through the head, JOHNROGERS FLANNERY.

5 and inserting closures into both ends of said hole. I fitness:

In testlmony whereof, I have slgned this EDWIN S. RYcE. 

